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blackfin: bf60x: add resume from hibernate 

Add Bf60x resume from hibernate support

Signed-off-by: Steven Miao <realmz6@gmail.com>
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bob Liu <lliubbo@gmail.com>
Signed-off-by: Sonic Zhang <sonic.adi@gmail.com>
This commit is contained in:
Steven Miao 2012-03-31 16:01:50 +08:00 committed by sonic
parent 49c2da53b7
commit 9faf4f08e7
1 changed files with 46 additions and 0 deletions
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46
arch/blackfin/cpu/initcode.c
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@ -509,6 +509,11 @@ maybe_self_refresh(ADI_BOOT_DATA *bs)
return false;
#ifdef __ADSPBF60x__
/* resume from hibernate, return false let ddr initialize */
if ((bfin_read32(DPM0_STAT) & 0xF0) == 0x50) {
serial_putc('b');
return false;
}
#else /* __ADSPBF60x__ */
@ -827,6 +832,7 @@ program_memory_controller(ADI_BOOT_DATA *bs, bool put_into_srfs)
while (!(bfin_read_DMC0_STAT() & DLLCALDONE))
continue;
serial_putc('!');
#else /* __ADSPBF60x__ */
/* Program the external memory controller before we come out of
@ -894,7 +900,46 @@ check_hibernation(ADI_BOOT_DATA *bs, u16 vr_ctl, bool put_into_srfs)
return;
serial_putc('b');
#ifdef __ADSPBF60x__
if (bfin_read32(DPM0_RESTORE0) != 0) {
uint32_t reg = bfin_read_DMC0_CTL();
reg &= ~0x8;
bfin_write_DMC0_CTL(reg);
while ((bfin_read_DMC0_STAT() & 0x8))
continue;
while (!(bfin_read_DMC0_STAT() & 0x1))
continue;
serial_putc('z');
uint32_t *hibernate_magic = bfin_read32(DPM0_RESTORE4);
SSYNC(); /* make sure memory controller is done */
if (hibernate_magic[0] == 0xDEADBEEF) {
serial_putc('c');
SSYNC();
bfin_write_EVT15(hibernate_magic[1]);
bfin_write_IMASK(EVT_IVG15);
__asm__ __volatile__ (
/* load reti early to avoid anomaly 281 */
"reti = %2;"
/* clear hibernate magic */
"[%0] = %1;"
/* load stack pointer */
"SP = [%0 + 8];"
/* lower ourselves from reset ivg to ivg15 */
"raise 15;"
"nop;nop;nop;"
"rti;"
:
: "p"(hibernate_magic),
"d"(0x2000 /* jump.s 0 */),
"d"(0xffa00000)
);
}
}
#else
/* Are we coming out of hibernate (suspend to memory) ?
* The memory layout is:
* 0x0: hibernate magic for anomaly 307 (0xDEADBEEF)
@ -927,6 +972,7 @@ check_hibernation(ADI_BOOT_DATA *bs, u16 vr_ctl, bool put_into_srfs)
}
serial_putc('d');
}
#endif
serial_putc('e');
}